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CN-121990840-A - Stretchable compressible SEBS-CNTs/carbon sponge, flexible piezoresistive sensor, and preparation method and application thereof

CN121990840ACN 121990840 ACN121990840 ACN 121990840ACN-121990840-A

Abstract

The invention discloses a stretchable compressible SEBS-CNTs/carbon sponge, a flexible piezoresistive sensor and a preparation method and application thereof, wherein the method comprises the steps of immersing melamine sponge into aqueous dispersion liquid of Carbon Nanotubes (CNTs), vacuum immersing, and drying to obtain CNTs/melamine sponge; annealing the CNTs/melamine sponge in an inert gas atmosphere to complete carbonization of a melamine sponge skeleton, obtaining CNTs/carbon sponge materials, placing the CNTs/carbon sponge materials into a solution containing SEBS, carrying out vacuum impregnation treatment, and drying to obtain the SEBS-CNTs/carbon sponge. The SEBS-CNTs/carbon sponge disclosed by the invention has excellent tensile property and compression property through the synergistic effect of the coating of the SEBS and the CNTs, and the assembled flexible sensor based on the SEBS-CNTs/carbon sponge has wide application prospect in the fields of intelligent wearing equipment, man-machine interaction interfaces and the like.

Inventors

  • Yang Gaochuang
  • CAO YONG
  • Lian ye
  • WU TAO
  • YU HANG
  • ZHOU FAN
  • LI TAO
  • ZHANG YULEI

Assignees

  • 河南省科学院碳基复合材料研究院

Dates

Publication Date
20260508
Application Date
20260209

Claims (10)

  1. 1. A method for preparing a stretchable compressible SEBS-CNTs/carbon sponge, comprising: Immersing melamine sponge into aqueous dispersion of carbon nano tubes, carrying out immersion treatment under vacuum condition to load the carbon nano tubes on the three-dimensional communicated skeleton surface of the melamine sponge, and then drying to obtain CNTs/melamine sponge, carrying out high-temperature annealing treatment on the CNTs/melamine sponge in inert gas atmosphere at the annealing temperature of 1000-1200 ℃ to carbonize the melamine sponge skeleton and convert the melamine sponge skeleton into a continuous three-dimensional porous carbon skeleton, and simultaneously retaining the carbon nano tubes loaded on the surface of the continuous three-dimensional porous carbon skeleton to obtain CNTs/carbon sponge material; The SEBS-CNTs/carbon sponge forms a continuous three-dimensional conductive framework together with the carbon nano tube by using the carbonized melamine sponge, and the SEBS is used as an elastic support phase to cooperatively deform with the conductive framework, so that the SEBS has the adaptive capacity of tensile deformation and the compressive piezoresistance response capacity.
  2. 2. The preparation method of claim 1, wherein the mass ratio of the carbon nanotubes to the SEBS is 1 (5-200).
  3. 3. The method according to claim 2, wherein the concentration of the aqueous dispersion of carbon nanotubes is 1 to 10 mg/mL; Or/and the concentration of the SEBS solution is 50-250 mg/mL.
  4. 4. The method according to claim 3, wherein the concentration of the aqueous dispersion of carbon nanotubes is 4 to 10 mg/mL; Or/and the concentration of the SEBS solution is 100-200 mg/mL.
  5. 5. The method according to any one of claims 1 to 4, wherein the drying temperature is 100 to 200 ℃ in the preparation of the CNTs/melamine sponge; or/and, in the preparation of the CNTs/melamine sponge, the time of vacuum impregnation is 30-90 min; Or/and, in the preparation of the CNTs/carbon sponge material, the inert gas is selected from high-purity argon or high-purity nitrogen; Or/and, in the preparation of the SEBS-CNTs/carbon sponge, the time of the dipping treatment is 20-40 min; Or/and, in the preparation of the SEBS-CNTs/carbon sponge, the drying temperature is 80-150 ℃.
  6. 6. A stretchable compressible SEBS-CNTs/carbon sponge obtained by the process of any one of claims 1 to 5.
  7. 7. Use of SEBS-CNTs/carbon sponge according to claim 6 in flexible sensors.
  8. 8. A stretchable piezoresistive flexible strain sensor comprising SEBS-CNTs/carbon sponge according to claim 6.
  9. 9. A compressible piezoresistive flexible stress sensor comprising the SEBS-CNTs/carbon sponge according to claim 6.
  10. 10. The stretchable piezoresistive flexible strain sensor according to claim 8 or the compressible piezoresistive flexible strain sensor according to claim 9, wherein the electrodes are copper foils, the electrodes are arranged at two ends or upper and lower sides of the SEBS-CNTs/carbon sponge, conductive silver paste is coated on the electrodes, copper wires are placed on the electrodes, and packaging is performed by using PDMS solution.

Description

Stretchable compressible SEBS-CNTs/carbon sponge, flexible piezoresistive sensor, and preparation method and application thereof Technical Field The invention relates to a carbon sponge, in particular to a stretchable and compressible SEBS-CNTs/carbon sponge, a flexible piezoresistive sensor, a preparation method and application thereof. Background With the rapid development of flexible electronic technology, intelligent wearable equipment and man-machine interaction systems, flexible sensors show wide application prospects in the fields of human motion monitoring, health evaluation, intelligent control, flexible structure state sensing and the like. The application scenario generally requires that the sensor can stably work in complex and changeable mechanical environments, and not only needs to have high sensitivity and quick response capability to external pressure or strain signals, but also needs to keep good structural integrity and electrical stability in various deformation modes such as stretching, compression and the like. Currently, the performance of flexible sensors depends to a large extent on the sensitive material system and its internal structural design. The traditional flexible sensing material mostly adopts a mode of compounding an elastomer matrix and conductive filler to realize force-electricity conversion, but a conductive network in the system often depends on random contact or tunneling effect of the filler, and irreversible damage easily occurs in a large stretching or repeated deformation process, so that signal drift or performance attenuation is caused. Furthermore, a single elastomeric material, while possessing excellent tensile properties, often has difficulty achieving efficient conductive path reconstruction under compression, limiting its application in multi-mode flexible sensing. Porous carbon sponge, which is a lightweight conductive material with a three-dimensional connected skeleton structure, has high porosity, low density and good electrical conductivity, and can generate remarkable resistance response through pore shrinkage and skeleton contact change in the compression process, so that the porous carbon sponge is widely focused in the field of flexible pressure sensing. However, the carbon sponge has limited mechanical toughness, is easy to break a framework or damage a structure under the condition of stretching deformation, and is difficult to meet the requirement of the wearable equipment on stretching adaptability under a large-amplitude motion state. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art. Disclosure of Invention The invention aims to provide a stretchable and compressible SEBS-CNTs/carbon sponge, a flexible piezoresistive sensor and a preparation method and application thereof, solve the problems that the existing carbon sponge material has defects in tensile property and a single elastomer material has limitations in compression response, further improve the overall conductivity by introducing carbon nano tubes on the basis of keeping a porous structure and a continuous conductive network of the carbon sponge, and simultaneously remarkably enhance the elastic recovery capability and tensile toughness of the material by introducing SEBS elastomer, and provide an ideal material for developing a high-performance flexible sensor. In order to achieve the above object, the present invention provides a method for preparing a stretchable and compressible SEBS-CNTs/carbon sponge, comprising: Immersing melamine sponge into aqueous dispersion of carbon nano tubes, carrying out dipping treatment under vacuum condition to enable the carbon nano tubes to be loaded on the three-dimensional communicated skeleton surface of the melamine sponge, then drying to obtain CNTs/melamine sponge, carrying out high-temperature annealing treatment on the CNTs/melamine sponge in inert gas atmosphere at the annealing temperature of 1000-1200 ℃ to enable the melamine sponge skeleton to be carbonized and converted into a continuous three-dimensional porous carbon skeleton, retaining the carbon nano tubes loaded on the surface of the continuous three-dimensional porous carbon skeleton to obtain CNTs/carbon sponge materials, carrying out vacuum dipping treatment on the CNTs/carbon sponge materials in solution containing hydrogenated styrene-butadiene segmented copolymer SEBS, and drying and solidifying to enable the SEBS to form a continuous elastic coating layer on the CNTs/carbon sponge skeleton surface and incompletely fill three-dimensional communicated pore channels of the CNTs/carbon sponge, thereby obtaining stretchable and compressible SEBS-CNTs/carbon sponge, wherein the SEBS-CNTs/carbon sponge forms a continuous three-dimensional conductive skeleto